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Returns a copy of +self+ with trailing substring <tt>suffix</tt> removed:
'foo'.delete_suffix('o') # => "fo"
'foo'.delete_suffix('oo') # => "f"
'foo'.delete_suffix('foo') # => ""
'foo'.delete_suffix('f') # => "foo"
'foo'.delete_suffix('x') # => "foo"
'тест'.delete_suffix('ст') # => "те"
'こんにちは'.delete_suffix('ちは') # => "こんに"
Related: see {Converting to New String}[rdoc-ref:String@Converting+to+New+String].
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